linux-kernel - Re: [PATCH 3/4] dt-bindings: mux: Add lan966 flexcom mux controller

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Date:   Tue, 3 May 2022 14:42:06 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>,
        krzysztof.kozlowski+dt@...aro.org, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, claudiu.beznea@...rochip.com,
        peda@...ntia.se
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, lee.jones@...aro.org,
        linux@...linux.org.uk, Manohar.Puri@...rochip.com,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH 3/4] dt-bindings: mux: Add lan966 flexcom mux controller

On 03/05/2022 12:55, Kavyasree Kotagiri wrote:
> This adds DT bindings documentation for lan966 flexcom
> mux controller.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>
> ---
>  .../mux/microchip,lan966-flx-mux.yaml         | 55 +++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mux/microchip,lan966-flx-mux.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mux/microchip,lan966-flx-mux.yaml b/Documentation/devicetree/bindings/mux/microchip,lan966-flx-mux.yaml
> new file mode 100644
> index 000000000000..8b20f531781a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mux/microchip,lan966-flx-mux.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mux/microchip,lan966-flx-mux.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: microchip Lan966 Flexcom multiplexer bindings
> +
> +maintainers:
> +  - Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>
> +
> +description: |+
> +  The Microchip Lan966 have 5 Flexcoms. Each flexcom has 2 chip-selects
> +  when operating in USART and SPI modes.
> +  Each chip select of each flexcom can be mapped to 21 flexcom shared pins.
> +  Define register offset and pin number to map a flexcom chip-select
> +  to flexcom shared pin.
> +
> +properties:

Usually you need allOf referencing mux-controller.

> +  compatible:
> +    enum:
> +      - microchip,lan966-flx-mux
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#mux-control-cells':
> +    const: 1
> +
> +  mux-offset-pin:
> +    description: an array of register offset and flexcom shared pin(0-20).
> +
> +required:
> +  - compatible
> +  - '#mux-control-cells'
> +  - mux-offset-pin

and reg?

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    mux: mux-controller@...04168 {
> +        compatible = "microchip,lan966-flx-mux";
> +        reg = <0xe2004168 0x8>;
> +        #mux-control-cells = <1>;
> +        mux-offset-pin =
> +                <0x18 9>; /* 0: flx3 cs0 offset, pin-9 */

You could put it in one line, I think.

> +    };
> +
> +    flx3 {
> +        atmel,flexcom-mode = <2>;
> +        mux-controls = <&mux 0>;
> +        mux-control-names = "cs0";
> +    };

No need for example for typical consumers. They are obvious and already
documented.

> +...


Best regards,
Krzysztof